Abstract

Today there is huge demand for radio spectrum in wireless communication networks. Fixed spectrum policy is a major problem in solving spectrum crisis. Dynamic spectrum access is one method which gives the solution by allocating the available limited radio spectrum band between different licensed and unlicensed users. Dynamically accessing the unused spectrum is known as dynamic spectrum access (DSA) which becomes a promising approach to increase the efficiency of spectrum usage. This allows unlicensed wireless users (secondary users) to dynamically access the licensed bands from legacy spectrum holders (primary users) on an opportunistic basis. In this paper, DSA approach by using hierarchical access model is proposed with Markovian Queuing model for centralized architecture. The blocking probability and mean access delay for infinite and finite users are also found out. Results are then compared.

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